SCR Denitrification Equipment for Gas Generator Sets

SCR Denitrification Equipment for Gas Generator Sets

SCR (Selective Catalytic Reduction) denitrification equipment for gas generator sets is a key environmental protection device used to reduce nitrogen oxide (NOx) emissions in the exhaust gases of gas generator sets. The following provides a detailed analysis from the aspects of equipment principles, core components, technical features, application scenarios, and development trends:

I. Equipment Principle

SCR denitrification technology involves injecting a reducing agent (such as ammonia water or urea solution) into the exhaust gas of gas generators. Under the action of a catalyst, NOx is reduced to harmless nitrogen (N₂) and water (H₂O). The main chemical reactions are as follows:

• 4NO + 4NH₃ + O₂ → 4N₂ + 6H₂O
• 2NO₂ + 4NH₃ + O₂ → 3N₂ + 6H₂O
• 
  

II. Core Components

1. Reducing Agent Storage and Injection System
   • Stores ammonia water or urea solution, precisely controlling the injection volume through metering pumps and nozzles to ensure thorough mixing with the exhaust gas.
   • Nozzle design must consider exhaust gas temperature and flow velocity distribution to avoid localized ammonia slip.
2. SCR Reactor
   • Filled with honeycomb or plate-type catalysts, providing a large specific surface area to accelerate the reaction.
   • The reactor must withstand high temperatures (typically 300-550°C) and complex exhaust gas components, requiring materials that are corrosion-resistant and wear-resistant.
3. Catalyst
   • Vanadium-Titanium-Based Catalyst: Good activity at medium to low temperatures, suitable for conventional gas generator sets.
   • Zeolite Catalyst: Strong high-temperature stability, suitable for generator sets with high exhaust temperatures (such as trigeneration projects).
   • Catalyst lifespan is typically 2-3 years and requires regular replacement or regeneration.
4. Control System
   • Monitors exhaust gas NOx concentration, temperature, and flow velocity in real time, dynamically adjusting the reducing agent injection volume.
   • Equipped with ammonia slip monitoring devices to ensure emissions comply with environmental standards (such as EU EN 14181 or China GB 13223).